选择题:设m, n是两条不同的直线, α, β, γ是三个不同的平面, 下列四个命题中正确的是( )

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题目内容:

设m, n是两条不同的直线, α, β, γ是三个不同的平面, 下列四个命题中正确的是( )

A.若m//α, n//α, 则m//n

B.若α ⊥ γ, β ⊥ γ, 则α//β

C.若α//β, m ⊂ α, n//β, 则m//n

D.若α//β, β//γ, m ⊥ α, 则m ⊥ γ

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